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Financial Risk Management - Summary of Net Exposure for Largest Currencies Impact on Sales (Detail) kr in Billions | 12 Months Ended
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Dec. 31, 2024 SEK (kr)
Disclosure Of Currency Exposure [Line Items] |
Sales transaction exposure | kr (0.2)
Cost transaction exposure | (0.1)
USD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 93.8
Sales transaction exposure | 41.7
Sales net exposure | 135.5
Cost translation exposure | (59.0)
Cost transaction exposure | (41.4)
Cost net exposure | (100.4)
EUR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 36.6
Sales transaction exposure | 1.2
Sales net exposure | 37.8
Cost translation exposure | (30.7)
Cost transaction exposure | (2.0)
Cost net exposure | (32.7)
INR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 15.1
Sales transaction exposure | (0.8)
Sales net exposure | 14.3
Cost translation exposure | (8.5)
Cost transaction exposure | 0.1
Cost net exposure | (8.4)
JPY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 9.0
Sales transaction exposure | 0.0
Sales net exposure | 9.0
Cost translation exposure | (3.0)
Cost transaction exposure | 0.0
Cost net exposure | (3.0)
GBP [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 8.8
Sales transaction exposure | (1.1)
Sales net exposure | 7.7
Cost translation exposure | (7.2)
Cost net exposure | (7.3)
AUD [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 5.9
Sales net exposure | 5.7
Cost translation exposure | (4.4)
Cost transaction exposure | 0.1
Cost net exposure | (4.3)
CNY [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 5.0
Sales transaction exposure | 0.0
Sales net exposure | 5.0
Cost translation exposure | (3.2)
Cost transaction exposure | 1.0
Cost net exposure | (2.2)
SAR [member] |
Disclosure Of Currency Exposure [Line Items] |
Sales translation exposure | 4.7
Sales transaction exposure | 0.3
Sales net exposure | 5.0
Cost translation exposure | (3.4)
Cost transaction exposure | 0.1
Cost net exposure | kr (3.3)

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- Definition Cost transaction exposure. + References No definition available. + Details
Name: | eric_CostTransactionExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cost translation exposure. + References No definition available. + Details
Name: | eric_CostTranslationExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Currency gain (loss) due to changes in foreign exchange rates. + References No definition available. + Details
Name: | eric_CurrencyGainLossDueToChangesInForeignExchangeRates
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Disclosure of Currency Exposure [line items] + References No definition available. + Details
Name: | eric_DisclosureOfCurrencyExposureLineItems
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Net cost exposure. + References No definition available. + Details
Name: | eric_NetCostExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net sales exposure net. + References No definition available. + Details
Name: | eric_NetSalesExposureNet
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sales translation exposure. + References No definition available. + Details
Name: | eric_SalesTranslationExposure
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_INR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_JPY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CNY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_SAR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |